Definition:
Yellow Sea
from The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide

Gulf of the Pacific Ocean between China and Korea; length approximately 1,000 km/620 mi, greatest width 700 km/435 mi; area 466,200 sq km/180,000 sq mi. To the north are the gulfs of Korea, Chihli, and Liaotung. There are many small islands to the east near the Korean coast. It receives the Huang He (Yellow River) and Chang Jiang (Yangtze Kiang), which transport yellow mud (derived from the soil known as loess, which was originally wind-blown from central Asia) down into the shallow waters (average depth 44 m/144 ft).

from The Encyclopedia of Tourism and Recreation in Marine Environments

The Yellow Sea, also called the West Sea in North and South Korea, is a part of the Pacific Ocean. It is located north of the East China Sea and between mainland China and the Korean peninsula. Its name comes from the sand particles that colour its water, originating from the Yellow River (Huang He). The line between the northernmost point of the Shandong peninsula and southernmost point of the Liaodong peninsula is the boundary between the Yellow Sea and the Bohai Sea. The line between the north side of the Mouth of the Yangtze River and the south-west corner of Cheju Island divides the Yellow Sea and the East China Sea. Korea Bay, between the Chinese Liaoning province and north-western North Korea, is also part of the Yellow Sea. The area of the Yellow Sea is 404,000 km2, with an average depth of 44 m and a maximum depth of 140 m. Its famous fishing grounds yield a rich harvest and attract many fishermen from Japan, China and Korea. Sea water temperature varies between 15 and 24°C over the year, and the salinity is relatively low, at about 32%.